package com.sky.service.impl;

import com.github.pagehelper.Page;
import com.github.pagehelper.PageHelper;
import com.sky.constant.MessageConstant;
import com.sky.constant.PasswordConstant;
import com.sky.constant.StatusConstant;
import com.sky.context.BaseContext;
import com.sky.dto.EmployeeDTO;
import com.sky.dto.EmployeeLoginDTO;
import com.sky.dto.EmployeePageQueryDTO;
import com.sky.dto.PasswordEditDTO;
import com.sky.entity.Employee;
import com.sky.exception.AccountLockedException;
import com.sky.exception.AccountNotFoundException;
import com.sky.exception.PasswordEditFailedException;
import com.sky.exception.PasswordErrorException;
import com.sky.mapper.EmployeeMapper;
import com.sky.result.PageResult;
import com.sky.service.EmployeeService;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.util.DigestUtils;

import java.nio.charset.StandardCharsets;
import java.time.LocalDateTime;

@Service
public class EmployeeServiceImpl implements EmployeeService {

    @Autowired
    private EmployeeMapper employeeMapper;

    /**
     * 员工登录
     *
     * @param employeeLoginDTO
     * @return
     */
    public Employee login(EmployeeLoginDTO employeeLoginDTO) {
        String username = employeeLoginDTO.getUsername();
        // String password = employeeLoginDTO.getPassword();
        // TODO 后期需要进行md5加密，然后再进行比对
        String password = DigestUtils.md5DigestAsHex(employeeLoginDTO.getPassword().getBytes());

        //1、根据用户名查询数据库中的数据
        Employee employee = employeeMapper.getByUsername(username);

        //2、处理各种异常情况（用户名不存在、密码不对、账号被锁定）
        if (employee == null) {
            //账号不存在
            throw new AccountNotFoundException(MessageConstant.ACCOUNT_NOT_FOUND);
        }

        //密码比对
        if (!password.equals(employee.getPassword())) {
            //密码错误
            throw new PasswordErrorException(MessageConstant.PASSWORD_ERROR);
        }

        if (employee.getStatus() == StatusConstant.DISABLE) {
            //账号被锁定
            throw new AccountLockedException(MessageConstant.ACCOUNT_LOCKED);
        }

        //3、返回实体对象
        return employee;
    }

    /**
     * 新增员工
     *
     * @param employeeDTO
     * @return
     */
    @Override
    public int save(EmployeeDTO employeeDTO) {
        // 创建数据层对象
        Employee employee = new Employee();

        // 对象属性拷贝
        BeanUtils.copyProperties(employeeDTO, employee);

        // 设置账号的状态，默认正常状态 1表示正常 0表示锁定
        employee.setStatus(StatusConstant.ENABLE);

        //设置密码，默认密码123456
        employee.setPassword(DigestUtils.md5DigestAsHex(PasswordConstant.DEFAULT_PASSWORD.getBytes()));

        //设置当前记录的创建时间和修改时间
        // employee.setCreateTime(LocalDateTime.now());
        // employee.setUpdateTime(LocalDateTime.now());

        //设置当前记录创建人id和修改人id
        // employee.setCreateUser(BaseContext.getCurrentId());
        // employee.setUpdateUser(BaseContext.getCurrentId());

        return employeeMapper.insert(employee);
    }

    /**
     * 分页查询
     *
     * @param employeePageQueryDTO
     * @return
     */
    @Override
    public PageResult selectByPage(EmployeePageQueryDTO employeePageQueryDTO) {
        // 设置查询条件
        if (employeePageQueryDTO.getPage() == 0) {
            employeePageQueryDTO.setPage(1);
        }
        if (employeePageQueryDTO.getPageSize() == 0) {
            employeePageQueryDTO.setPageSize(5);
        }
        PageHelper.startPage(employeePageQueryDTO.getPage(), employeePageQueryDTO.getPageSize());
        Page<Employee> page = employeeMapper.selectByPage(employeePageQueryDTO);
        return new PageResult(page.getTotal(), page.getResult());
    }

    /**
     * 启用禁用员工账号
     *
     * @param status
     * @param id
     * @return
     */
    @Override
    public int startOrStop(Integer status, Long id) {
        Employee employee = Employee.builder()
                .status(status)
                .id(id)
                .build();
        return employeeMapper.updateById(employee);
    }

    /**
     * 根据id查询员工
     *
     * @param id
     * @return
     */
    @Override
    public Employee selectById(Long id) {
        Employee employee = employeeMapper.selectById(id);
        // 不返回密码给前端展示
        if (employee != null) {
            employee.setPassword("****");
        }
        return employee;
    }

    /**
     * 更新员工
     *
     * @param employeeDTO
     * @return
     */
    @Override
    public int updateById(EmployeeDTO employeeDTO) {
        Employee employee = new Employee();
        // 组装员工对象数据
        BeanUtils.copyProperties(employeeDTO, employee);
        // employee.setUpdateTime(LocalDateTime.now());
        // employee.setUpdateUser(BaseContext.getCurrentId());
        return employeeMapper.updateById(employee);
    }

    /**
     * 修改密码
     *
     * @param passwordEditDTO
     * @return
     */
    @Override
    public int updateByPassWord(PasswordEditDTO passwordEditDTO) {
        // 查询员工密码
        String password = employeeMapper.selectById(BaseContext.getCurrentId()).getPassword();
        String oldPassword = DigestUtils.md5DigestAsHex(passwordEditDTO.getOldPassword().getBytes());

        if (!password.equals(oldPassword)) {
            // 传入的密码与数据库旧密码比对不一致
            throw new PasswordEditFailedException(MessageConstant.PASSWORD_EDIT_FAILED);
        }

        // 组装数据,封装加密后的新密码
        Employee employee = new Employee();
        employee.setId(BaseContext.getCurrentId());
        employee.setPassword(DigestUtils.md5DigestAsHex(passwordEditDTO.getNewPassword().getBytes()));
        return employeeMapper.updateById(employee);
    }

}
